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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f0a67359de31d04d1fa3df288c0f8701ef83e27a37edda8f350277f07829edf' 
  AND token = 'djVetiqhUzgQ0ZydEKLNgfhhacZzcaDNf8wmsXEG3Lw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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