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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea749a589742af4d0bf186df0c3d098c0d4b338c6d8fe4677cb70f009ff66e80' 
  AND token = '2r5KbJl82FpEm4WUu/KGmdNUv+KAnUrhOM1Grrj2xNA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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