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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30a7237d33d31fb43e8f27eb8325f29080de5c70112f58f5a38b8c137ad42e88' 
  AND token = '5mLVrlFB0YZLKyO37jqnsIMw14an88L7aKE+qLB11hM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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