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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd8b871123f3cbcdb0ca85e1f536feb6fd6ee45bb3b6d60a79336586120384cf3' 
  AND token = '7sgq8Z9Xp0I35ukPjPRKI4gF8SKm4okt/Gb8WDWfF3c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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