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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c0b68faf21af50511c991ec6f9974977142ed6ee58479cc4b60dae1c7678c98f' 
  AND token = 'mLnGBlUcBl3YjwYR749hnqNXLVpAGzCVTTsuieoNVCA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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