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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f42e45fb7deea62c0f492ede62fa59e5640071bb60af9fbe01131eec304022e5' 
  AND token = 'aFl7jt9/pQ8MK87aisZeiG2hcRcEudjTz/P61VbW6Nc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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