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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5a880f09dbaf93f0a7ed15090e7608862a9a635c925461066161919f116585aa' 
  AND token = '5jYajLKjJWvTnHYO3kTxM0uLvVkLYaote07i54/VAVI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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