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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f3662ffa643026c3a6c18a47d5dcae73137ce40c04b7af144babbd2a436d7f09' 
  AND token = 'ZEtqiK7chw5+9SsBQGpDMg2KQe45doH2jUb8Xe5tY58=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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