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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '76a681e508abcccf4b51c210abb2c19bd50ab5426cbb0d1a82cd8905b6effe70' 
  AND token = '5TLNbl37ihtJEknNzTqpt/5v/Z6z5MYjxNVS0e1jLtw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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