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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '76aa1f5ce5432f3ab709d3f0f7575ffd01972e07f236ca864bbeb7c744c8b43d' 
  AND token = 'roRkmVZcdZRSv0fxUoP6ygVwt42PkkmSK3+p8qhHsVI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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