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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf0c92723d2b95fe8e3086499df4d941eab1db168501f46a016283c6461b5fd4' 
  AND token = 'mbLhpwDS0Poz2Ma4A5ly7sai7wKPsrAeIcdRQ/ZCAV8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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