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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '831f66cbea1bb16b157bc4d579461fcc45f1bdc1746e68865368aa122d9e7e53' 
  AND token = 'WV42mgf1gdl4ooTTe7ni3rD+UXFckdKl/jy7Qtd5qs0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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