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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a1ce1942c122386e20d6d5dc1cbb8158ec1e5b7d43ec81710898526ecc35abfa' 
  AND token = 'xaymDhVBJWVzDziNf0vCPgXP2ULNvLiriwzP6VAusR8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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