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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f4de6a1b308135fc2eaa9bdb613b8d8a0302b3815d4dfdb230fa26798a529e8e' 
  AND token = 'WiQfn8In7b1y88jUNX92ULUMwEzIcQT3lrkLVSU9Cj0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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