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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '44e6d6d80500dcfbbd2d7cf8e81c4a9f9d97d329befee67752d5216781a2ba6d' 
  AND token = 'B+0yynbvCeHFXpuSo7oiZeKXHMLx//r8C/JyIchFrXE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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