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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9851a09b0db79e1a65db79ee453211300e56cd50970c500c0dbf92bfad935576' 
  AND token = 'o0qhwSsv8x8nlszrWGG9wdrVkcqxjsp6V9/5yIrFIds=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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