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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '055946dd633caf0e8ff770ea57ad638d00f0c61e940eb140d569d4a461fb545c' 
  AND token = 'y7/2Rh1KKaWJgzD0BvMK7KbAGzbnhHq/zdeRp1teTvQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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