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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7db2d5d4e98e2f96b31fa72b461f5abf20e90494f62349578f05d0c4e2d39894' 
  AND token = 'h5/1arxeND1k6sbF0Aj1sFVQM70FEWnOVSsWjloW7k4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00012

JSON explain

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