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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '58035c6991f908642a9a5bb02a4a7806adb06d2fca10c98cc6bb59db10c555f5' 
  AND token = 'P092G2BGWdg/4QW9zXMObpnZ9VAc2vqRcd/FQi6xz0Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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