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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2143d238aa45cb2d28044966e3858321aeb0d8f6e82d4ff56d1eec477c1de86f' 
  AND token = 'wAHI+ODFKiFxPE5Nu3u9gbCTWkiaD1XoGllAlPwS2IE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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