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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '13f38c42637395bdbed556c4becff448a6b3f780be63048aae8b3c4483537888' 
  AND token = 'EkR2EopHRV5aqhP3p/Oz4nPpok8ooXUrL8CV8nvEax8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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