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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a9aed6e25cf2bbd30f3401975eb2e47b04803f90f79c238b077ea9e424cb477b' 
  AND token = 'sx+nLSZbL7ondePWcFwXRDeYC3BQbHEOWSqTBpariq8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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