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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f144d3d2470961acfd429e6ee8f55d88ef4323e1892ef51f6e2e33504ae3c3d7' 
  AND token = 'KBxuniuQd7R9R/RIUjYm94F+GAHM6z+/1Pk7cpYYVuk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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