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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4b465717eb2c222100da596aeca1e628baf347f17cdfa35771dc897d5f3121d3' 
  AND token = 'HtIgi75F3R34amygpGJgF6PdD3Wxz+wySyYqG/XJexI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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