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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd161720e6556812e0f08bbab6f349d42c5d7bb322d20716456eb6a38406f1f2a' 
  AND token = '/Yd5U1yQXcYz2c0CuwG9V30eokkO4b3HIIbMcRTBc5E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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