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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1aa77486e280d61c5438e2a7c9e2aa06c1b19c51255a76c4178319789b6817d3' 
  AND token = 'qVOg6qLrKbKZW0OQfP4nqponCpw8dxNvVnPlAviieGQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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