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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71af9e2c403f227cc79f3e29b5358fbad644ae6733aa930947b80889380dba9d' 
  AND token = 'wP3yt/Tm9cIxcBpLKHfv+hyq9e3ITlQkb5Bpe+e8XC4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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