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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ed949b5b6de2d6318241735b5b103f441653a9f5c5e3b238220e38c13c9efad7' 
  AND token = 'GxKuuTfxwNc6DiEyTqF8oxdJyEHLmFjT06oQnXAsF2w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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