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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71792e51a737accf18183b85d6c8a2d7d8e3a6cd0f5a60940241919c1ab3236c' 
  AND token = '0LbadpWEvAeaJO8pntLTAacozNQsJ68QOp3hj98NCa4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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