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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0a23ba4e776c0e9df65f8c7f3bf4fdeabe68203df8e98b2cb3eb0903d3aabcc1' 
  AND token = 'OTmGxyFJVnJCPzofmeuNPHtydn72dRUpJCYhnN1J9Vg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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