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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7f08d97aea0618790a0b340da3d33f6ab3a0724a94fa03224c9566a05bc38777' 
  AND token = 'NO+vkY7YN8/rv7VgfDMjVi8QZStZvQ/SOcGi6QGYtzQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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