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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2dc83d0b4f2d1f44170969ef3155775da95377abfc0d60daa6ac74a65a67103e' 
  AND token = 'lgBKiSnpU4CNMLib/UL4nOjhLe97+m+p0+9S67N3+vA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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