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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '02926322535961de9018e5f0659d5d0001285d3d1c7494dd56281a72e5d95542' 
  AND token = 'U9o9gizfFSd6krNrGAnGawyGcBBstGx0F/WTNbKiEaU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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