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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9bec15c35fd44d51a39aeb4b8c684fa3d4cbda31856e89b96b55869afa49496e' 
  AND token = 'bK/NpQzhzP9fCrq6B+tsggJvkviXFaalgqYbTLtjeOw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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