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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab9ab6a8165b33833c38f67d698eba5bfe552d4a431642326f780d4f6035094f' 
  AND token = 'jFEhK+1A1O453AmrNAwNRQkfj9l+27fdMJQVuzQhJVs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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