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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '808cb3904c2c590a2ba96272fbefb4db880bde05f12634ba6ee27afca3812c0d' 
  AND token = '8my5rHpRZQAyHEMQzlb1DNViUqxGjrXb/M35h0HebOI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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