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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '908070c52755813e04c30a6c69c96ddfecc632430c5d5c42ea535875718be35e' 
  AND token = 'nZS5B9i2ieGfdnqjTKZ6NMdChKjTL8FRJVDcdPGjens=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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