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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f20180b8b2cfea2eb13adbf0f6632132638adf23520d25a3df9337f715881ca5' 
  AND token = 'TT8il2LS8vhMRG1tLmNxqvhz0CUTlcoBu4r3dEAHb2Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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