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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56da7538cd157debde39eec2b5fe4039969a273d1ed21c0a402dc2f07415bb93' 
  AND token = 'nl59RH8w2YOwHuf4yM99mHFLrG2KUwFBxPdy84QoLJw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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