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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ddbae2a64e5478fa1798c75bc5b1fa568a7aacc0b44fd35442bc136d4cf15274' 
  AND token = 'aSE5E8s7MVZtP9SdduGLH7wNtNcGAueRjqZckg4Go4c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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