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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '58c58a72167217868528a02faf84cd5c8cbd0ff4ec47c8bbbdb59781d68e72ca' 
  AND token = '2EFsPefBT6F+aXsFhhjWFA12aPr1KXVsAbn/ajGwBLs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}