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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f9ba22e6adddd24a465c5b00e3a863c2b23d4527c645788d1a290167fdea22a2' 
  AND token = 'e3DwLinyttjQ4yx0pSNrOzo37zxQ0T3vwI8honLhaq0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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