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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2a97fecd8bad03b9784b4123d5c68612ca4ade29866e942958c5956f0aed576b' 
  AND token = 'a0+oyzRZwDPRCMfaWK16NQOjsI61HAaiPeV8r1KYwcM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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