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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '35f5a2408f701ac92732cfec7d338b1093311ecb45977e08711067a91d7ece2c' 
  AND token = 'g8oGhs8w2c8Aqm3nLqLVseTImaCzCGFRBXKhT2AlAhM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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