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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '00d1c796fb791404df6ead92c4a94c7fe15180a0ef14a62f89f735fb1b72d615' 
  AND token = 'Iti8+gm4mCPuSkC0Br+8K3HOS6SCwomqQ8sg4zq8RdM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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