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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b276c314df8f1a2dce4765c7169aa1222e38cad9a9e72c141554c86ce576752b' 
  AND token = 'QwwQkTe9PzNS9QJRciZ2WP2JUsxaQkYkcZ5dOiF3Ioo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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