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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93aab8f42b4aae5520bca76c9cc01896d4018b140c105be0b0fcb7996cdf2e70' 
  AND token = 'yzgpjAiI/0icpTYA37mmQxNSTuDMISiUam1dT8u1eq0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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