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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a2b11c90992c1164202c59999a07d4fae06fcf117c57dff503e7484ec85b3ea' 
  AND token = 'SoPCORmABADoik7idnJB2QT9L9spKKyWjT0Io7V0+t4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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