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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3530c6efda85cbf928daf8f03d6467f5a866f5109be2de2960cb570f3f0a82c6' 
  AND token = '8Em0GiLuP15xXOPb7Lm/ca6tc58+8zmEwNtPJm8JlZc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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